Symlink Vulnerability in Avast Antivirus Allows Arbitrary File Renaming

CVE-2019-11230 · LOW Severity

AV:L/AC:L/AU:N/C:N/I:P/A:P

In Avast Antivirus before 19.4, a local administrator can trick the product into renaming arbitrary files by replacing the Logs\Update.log file with a symlink. The next time the product attempts to write to the log file, the target of the symlink is renamed. This defect can be exploited to rename a critical product file (e.g., AvastSvc.exe), causing the product to fail to start on the next system restart.

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